Measurement of the $B_{s}^{0}$ Lifetime Using Semileptonic Decays

Open Access

We report a measurement of the

B_{s}^{0}

lifetime in the semileptonic decay channel

B_{s}^{0} \to D_{s}^{-} μ^{+} ν X

(and its charge conjugate), using approximately

0.4 {fb}^{- 1}

of data collected with the D0 detector during 2002–2004. Using 5176 reconstructed

D_{s}^{-} μ^{+}

signal events, we have measured the

B_{s}^{0}

lifetime to be

τ (B_{s}^{0}) = 1.398 \pm 0.044 (stat)_{- 0.025}^{+ 0.028} (syst) ps

. This is the most precise measurement of the

B_{s}^{0}

lifetime to date.

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Measurement of theBs0Lifetime Using Semileptonic Decays